...and to expand on AviationExam's post, this is further compounded by member states not notifying corrections to the JAA.
As an example the UK ATOs worked with the CAA for years (ten years?) correcting the errors in the local question bank the CAA used, with the CAA assuring us that these corrections were being forwarded to the JAA 'Subject Expert Teams'. When the use of the EASA QB became mandatory lots of the questions that we thought had been removed reappeared. It turned out that the CAA had not sent the notifications through. Was there a record of the changes the CAA had made that they could now send through?.... Errr... no, sorry.
The CAA made a semi-valid point in their defence that there was no point notifying changes to the JAA during the last years of its existence or to EASA in the early years as there was no-one to notify, no funding was available for trivia like getting the question bank sorted out. Shameful.